Hello everyone,
I just received 8x EVE lf280k from Docan Power. The buying process was pleasant and professional. Had contact with Amy Zheng and Beki and both were really helpful and answered all my questions. Shipping was 6 weeks.
Opened up the packages today and all cells seem to be in good shape. Voltages range between 3.302 and 3.303 between all 8 cells. Manufacturing dates are all December 2021. Visually the cells look brand-new, except they are slightly swollen. I'm not sure whether this level of bloating is acceptable for (assumingly) grade A EVE cells. I also noticed that the swelling is visible in the picture I was sent pre shipment (see first photo). Since I was in the middle of preparing to move I didn't take a closer look at the provided picture.
The other photos are cells 5-8 but 1-4 look the same.
I wanted to start compressing and top balancing today. However, since I just noticed the bulging I would appreciate some feedback from the community. Does it seem like an acceptable degree of swelling or does it mean trouble in the future.
Thought about discharging a bit more before compressing. What do you think?
Best regards
Odd, this is the first time I've heard anyone report a problem like this from Docan. The bulge you are seeing is from someone not paying attention when charging or discharging the cells. If you stick between the recommended voltages (2.5v to 3.65v) you will never get this problem. It doesn't appear too bad, but it certainly indicates someone over charged or over discharged these 4 cells. Probably not by a significant amount, and likely the cells are just fine. Probably best to test them and see if they are able to give full capacity, and then decide if it is worth the effort to send them back. These were probably returned to Docan.